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Ok, so maybe pack a couple spare o rings. My main worry is, if something catastrophically leaks, where will I find brake fluid? Could I use olive oil or something?
William.-
In a pinch, yes, or better: baby oil. A few youtubers have done baby oil experiments and in the short term there are no ill effects. It will void your warranty though if you care about that...
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Citroën (car brand) brake fluid would work, and so would baby oil: https://www.youtube.com/watch?v=drBghc6GSWQ
Edit: @chiroshi beat me to it!
chiroshi
Jaap
I've had the O-ring where the hydraulic line meets the rear calliper fail somewhere in rural France. None of the bicycle shops within 30km had that O-ring so after the third descent without a rear brake I called it quits and caught a train home.
I have to say, this was about 4 years ago. Hydraulic road bike disc brakes weren't a thing at the time. Nowadays more shops would probably stock the right O-rings for Shimano brakes. Also since that incident I haven't had any issues at all with my brakes.